Synthesis, crystal structure and screening for anticonvulsant and antianxiety activities of three new Ni(II), Cu(II), and Zn(II) dithiocarbamate complexes

A potassium N-(4-fluorobenzyl) N-(naphthalen-1-ylmethyl) dithiocarbamate ligand (fbnm) has been isolated in a basic medium and its Ni(II), Cu(II), and Zn(II) complexes 1-3 were synthesized. All new compounds have been characterized by elemental analyses, magnetic susceptibility, IR, NMR, and UV-Vis techniques. Complexes 2 and 3 have been further characterized by single-crystal X-ray diffraction data. Zn(II) complex adopts tetrahedral geometry whereas Ni(II) and Cu(II) complexes adopt square planar geometry around the metal ions. In addition, the bite angles found around the metal chelate rings in complexes 2 and 3 suggest that these geometries are slightly distorted from regular geometry. Complexes 2 and 3 are stabilized by intermolecular C-H & sdot;& sdot;& sdot;S, C-H & sdot;& sdot;& sdot;pi and CH & sdot;& sdot;& sdot;F interactions. The thermal degradations of metal complexes 1-3 have been examined by TG-DTA data which designates that metal sulfide is formed as the final entity. The anticonvulsant activity of ligand fbnm and its Ni(II), Cu(II), and Zn(II) complexes have been tested through MES test and PTZ induced convulsion test and found that complex 2 may be used as an anticonvulsant compound in the future by further biochemical or neurotransmitter estimations to control the onset of generalized tonic-clonic seizures. The antianxiety activity has also been performed via Elevated plus maze and Open field test and observed that all synthesized compounds are non-significant for anti-anxiety effect.